In Situ Optical Tracking of Electroablation in Two-Dimensional Transition-Metal Dichalcogenides

Anjli Kumar, Amritanand Sebastian, Saptarshi Das, Emilie Ringe

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6 Scopus citations


Two-dimensional (2D) transition-metal dichalcogenides (TMDs) are a unique class of 2D materials possessing unique optoelectronic properties when exfoliated into mono- and few-layer sheets. Recently, electroablation (EA) has become of interest as a promising synthesis method for single-layer sheets of TMDs. Here, we introduce spectroelectrochemical micro-extinction spectroscopy (SE-MExS) as a high-throughput technique to study electrochemical thinning of TMDs as it occurs. This approach enables the parallel use of spectroscopy and imaging to nondestructively characterize 2D materials in situ. We unravel optoelectronics of the TMDs by observing changes in optical properties during EA. We find that the EA process for MoS2, WS2, MoSe2, and WSe2 occurs edge first, generating high density of edge sites. Our results show that stable monolayers of MoS2, WS2, and MoSe2 can be synthesized from bulk precursors by the EA process, while conversely, no WSe2 remains postablation.

Original languageEnglish (US)
Pages (from-to)40773-40780
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number47
StatePublished - Nov 28 2018

All Science Journal Classification (ASJC) codes

  • General Materials Science


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